For instance CSB filtered on Afghanistan: https://www.codingame.com/leaderboards/puzzle/coders-strike-back/global?column=country&value=AF
The top of the page looks fine, until you scroll down to about the middle (players around rank 41K to 53K). Keep scrolling down, the same players stay on the page, until reaching the very end. Suddenly there is a single player at the top. Scrolling back up does not show more players, again until reaching somewhere around the middle.